The thing with people who switch to DDG is, they do so consciously for privacy reasons but then forget that the reason G's results are so good is because they add little bits of context in through their profiling. But that doesn't mean that DDG's results can't be as good as G's, it just means you need to add that context yourself. Like if you search for a coding problem, add your computer language name to the search query. Or if you're search for a restaurant, add in your home town too.
I've found DDG's results to be comparable to Google's and in fact in the last ~3 years of exclusively using DDG, I can count on one hand the number of times I've tried searching for something in Google after a failed search in DDG.
Image searching is a little more hit and miss though. G's image search is better -- generally speaking. However DDG doesn't include Pinterest spam. So if you're after something specific using image searching, Google is better. But if you're after a general list of usable images, then DDG is better.